JP2007330375A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low seating height-type chair with high stability by suppressing the height of a supporting base and that of a seating body supported by the supporting base. <P>SOLUTION: In the chair, the seating body 2 is supported by the supporting base 15 which is provided on a leg body 1. The leg body 1 comprises a pair of right and left side legs 9 which are formed in a shape with both ends turned down in a side view and have front legs 9a inclined forward and downward and back legs 9b inclined backward and downward, and a horizontally-directed connecting member 10 for connecting the vicinities of the top portions of the side legs together. The supporting base 15 is provided on the top surface of the horizontal central portion of the connecting member 10. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a chair that supports a seat by a support base provided on a leg.

A general chair used in an office or the like forms a leg body with a pedestal that faces up and down, and a plurality of (4 to 5) leg poles that radiate at the lower end of the pedestal. In most cases, the seat is supported by the provided support base and the lower end of the backrest is pivotally attached so as to be tilted backward (see, for example, Patent Documents 1 and 2).
JP 2004-33449 A JP-A-2005-177180

  Like the chair described in the above-mentioned patent document, if the leg body is provided with a pedestal, and the base is supported by the support base provided at the upper end thereof, and the lower end of the backrest is pivotally attached, for example, the pedestal Even if it is lowered to the lower limit position by lifting means, there is a limit to lowering the height of the support base and the seat supported by it, so let's get a low seat height type chair that can be seated in an easy posture When you want to, it becomes difficult.

  Moreover, since the support base that supports the seat is provided at the upper end of the pedestal, the chair may be unstable depending on the sitting posture even if it has 4 to 5 leg rods facing the radial direction at the lower end. It may become.

  The present invention has been made in view of the above problems, and by providing a leg body without a pedestal, the height of the support base and the seat body is kept low, and a low seat height type and highly stable chair is provided. The purpose is that.

According to the present invention, the above problem is solved as follows.
(1) In a chair configured to support a seat by a support base provided on a leg, the leg is shaped like a side view having a front leg that tilts forward and downward and a rear leg that tilts backward and downward. A pair of left and right side legs to be formed and a connecting member facing in the left-right direction that connects the vicinity of the tops are provided, and the support base is provided on the upper surface of the central part in the left-right direction of the connecting member.

(2) In the above item (1), the connecting member has a U-shape as viewed from the front with standing pieces on both side ends of the recumbent, and a support base is provided on the upper surface of the recumbent and the upper ends of both standing pieces are Adhering to the opposing surfaces of the tops of the left and right side legs.

(3) In the above item (2), by extending both standing pieces forward and upward, the recumbency is positioned on the rear leg side with respect to the top part of the side leg.

(4) In any one of the above items (1) to (3), the front legs and the rear legs of the left and right side legs are respectively formed in a front-back C-shape and a rear-C-shape in plan view. And expand outward.

(5) In any one of the above items (1) to (4), the front ends of a pair of left and right forward arms on the backrest support frame with the backrest attached to the front surface on both left and right sides of the support base. The back support frame is pivoted so that it can tilt backward.

(6) In the above paragraph (5), the front part of the support base protrudes forward from the top part of the side leg, and the lower left and right side parts of the front end part of the seat body are placed on the left and right side parts of the front end part. While pivoting with a pivot that faces in the direction, the lower surfaces of both sides near the rear of the seat are pivotally attached to the left and right forward arms of the backrest support frame with the pivot that faces in the left-right direction.

  According to the first aspect of the present invention, the left and right side legs are shaped like a side view, the height is kept low, and the support base that supports the seat body connects the vicinity of the tops of the both side legs. The seat has a lower height than the conventional chair with a support base at the upper end of the pedestal. A vintage chair can be provided.

Further, since the support base and the seat body supported by the support base are located at the center between the left and right side legs, and the center of gravity of the entire chair is low, the stability of the chair when seated is increased.
Furthermore, since the load of the seat is substantially balanced near the tops of the left and right side legs, that is, near the joints between the front legs and rear legs of both legs, the stability of the chair is further improved. .

  According to the second aspect of the present invention, the connecting member has a U-shape when viewed from the front, and the reed provided with the supporting base is necessarily located below the top of the side leg. And the height of the seat supported by it is lower.

  According to the third aspect of the present invention, since the center of gravity of the seat body when sitting is closer to the rear leg, it is possible to sit in a comfortable posture in a chair having a backrest.

  According to the fourth aspect of the present invention, the stability of the chair when seated is further increased, and the possibility that the lower leg portion of the seated person will hit the front leg is reduced.

According to the invention of claim 5, the front ends of the left and right forward arms of the back support frame are
Since it is pivotally attached to both the left and right sides of the support base located on the upper surface of the central part of the connecting member and below the seat, the lower part of the back support frame is located between the left and right side legs, making it less noticeable. Get better.
Further, the backrest support frame can be largely tilted backward without interfering with the rear legs of the left and right side legs.

  According to the invention described in claim 6, the front and rear portions of the seat body can be stably supported by the support base and the backrest support frame, and the seat body is also tilted backward in conjunction with the rearward tilt of the backrest support frame. This improves sitting comfort.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a front perspective view of the chair of the present invention, FIG. 2 is a front view, FIG. 3 is a side view, FIG. 4 is a side view when the backrest is also tilted backward, and FIG. 5 is a rear view. The chair is attached to the front of the leg (1), the seat (2) supported by the leg, the back support frame (3) pivotally attached to the leg (1), and the front. A backrest (6) comprising a mesh-like backrest plate (4) and a cushion body (5), and a right and left right side of a rhombus frame attached to the lower end of the backrest support frame (3) A pair of armrests (7).

  As shown in the perspective view of FIG. 6 and the plan view of FIG. 7, the leg body (2) has a front leg (9 a) having a caster (8) at the front end and a front lower slope (9 a), and the front and rear dimensions are longer than this. A pair of left and right side legs (9), (9), which are formed in a side view, comprising rear legs (9b) having rear casters (8) having casters (8) at the rear end, and both legs (9 ) And a connecting member (10) having a U-shape in a front view attached to an opposing surface near the top.

  The reason why the rear leg (9b) is longer than the front leg (9a) is to ensure the stability of the chair when the backrest (6) is tilted backward.

  The front legs (9a) and rear legs (9b) of the left and right side legs (9) have their apexes so as to expand outwardly into a front-shaped C-shape and a rear-shaped C-shape in plan view, respectively. As the center, it is bent outwards to enhance the stability of the leg (1).

  A short shaft portion (11) facing in the left-right direction is integrally connected to the top of each side leg (9), and a mounting piece (12) is attached to the inner surface of the front end portion of the rear leg (9b). It protrudes downward (see FIG. 3).

  On the inner end face of the left and right short shaft portions (11), the upper ends of the pair of left and right standing pieces (10a) and (10a) facing the upper front of the connecting member (10) Also on the side surfaces, both side surfaces of the side heel (10b) located slightly on the rear leg (9b) side of the standing piece (10a) of the connecting member (10) are screwed by bolts (13) inserted from the outside respectively. It is worn.

  The head of the bolt (13) inserted into the short shaft portion (11) is covered with a circular cap (14) (not shown in FIG. 5) fixed in the concave hole on the side surface of the short shaft portion (11). ing.

  The rear end of the support base (15) for supporting the seat (2) is formed on the upper surface of the upward bulging portion (10c) formed at the center portion in the left-right direction of the horizontal rod (10b) in the connecting member (10). However, the front end portion of the support base (15) is fixed by the bolt (16) such that the front end portion protrudes forward of the reed (10b).

  The height of the upper end of the support base (15) is such that the connecting member (10) has an upward U-shape, the upper end of the upright piece (10a) is at the top of the side leg (9), and the horizontal arm (10b) By sticking to the attachment pieces (12) of the rear legs (9b), the upper legs of the side legs (9) protrude slightly upward.

  As shown in FIGS. 3 and 5, the backrest support frame (3) stands behind the seat (2), and has a forward arm (17 a) inclined obliquely rearward and upward at the lower end. It consists of a pair of left and right side frames (17) and (17) and a rearward convex arc-shaped upper frame (18) that joins the upper ends of both side frames (17). The front-rear side view has a substantially vertically downward U-shape.

  The left and right side frames (17) have a left and right dimension that is smaller than the distance between the rear legs (9b) and (9b) of the pair of left and right side legs (9). When tilted backward, the forward arm portion (17a) can tilt between the left and right rear legs (9b) without interfering with it.

  As shown in FIG. 6, inwardly bent portions (17b) that are substantially coaxial with the short shaft portion (11) at the top of the side leg (9) are connected to the front ends of the left and right forward arms (17a). The inwardly bent portion (17b) is rotated around a torsion shaft (not shown) facing in the left-right direction in a reclining mechanism such as a known rubber torsion unit provided in the support base (15). It is connected in a state where it is urged in a counterclockwise direction when possible and always in a side view. As a result, the backrest support frame (3) and the backrest (6) attached to the backrest support frame (3) are inclined backward about the support base (15) when the seated person pushes the backrest (6) backward. (See FIG. 4).

  As shown in FIG. 3 and FIG. 6, on the outer end surface of the shaft-like support portion (19) that is connected to the front end of the support base (15) and whose left and right end portions protrude outward from the support base (15). In addition, the inner surface of the inwardly bent portion at the lower end of the pair of left and right seat support links (20) (20) facing in the vertical direction is pivotally attached to the front and rear by the pivot (21) facing in the left and right direction. ing.

  Further, seat support pieces (22) and (22) project upward from the upper surfaces of the front end portions of the left and right forward arms (17a) of the back support frame (3). Reference numeral (23) denotes a rectangular parallelepiped armrest mounting portion that protrudes from the upper surface of the forward arm portion (17a) so as to be continuous with the seat support piece (22).

  At the upper end of the left and right seat support links (20), the left and right sides of the front end of the seat frame (24) attached to the lower surface of the seat (2) are pivoted by the pivot (25) facing in the left-right direction. Further, the left and right sides of the rear side of the seat frame (24) are pivoted to the upper ends of the left and right seat support pieces (22) so as to be pivotable by a pivot (26) facing in the left-right direction. (See FIG. 3).

  As a result, the front part of the seat body (2) is connected to the left and right side parts of the front end of the support base (15) substantially integrated with the leg body (1) via a pair of left and right seat support links (20). The middle part near the rear part of the seat body (2) is supported by the left and right forward arms (17a) of the back support frame (3) via a pair of left and right seat support pieces (22). Is supported by

  Therefore, as shown in FIG. 4, when the backrest support frame (3) is tilted backward together with the backrest (6), the seat body (2) is also tilted rearward and downward in conjunction therewith. After the seat (2) is attached, the rear part of the front leg (9a) and the front part of the rear leg (9b) of the both side legs (9) are positioned inward from the both side edges of the seat body (2). In addition, both side legs (9) of the leg body (1) are not protruded greatly outward (see FIG. 2).

  As described above, in the chair of the above embodiment, the front lower end of the backrest support frame (3) is the upper center between the legs (9) and (9) of the leg (1), that is, the seat (2 ) Is pivotally mounted on a support base (15) that is substantially integral with the leg (1), so that the backrest support frame (3) and the back support frame (3) and back The radius of rotation up to the upper end of the bow (6) becomes large, the backrest (6) can be tilted backwards with a small rotation angle, and the rearward projecting dimension when tilting backward is also reduced.

Further, since the legs (1) and the seat (2) can be tilted rearward without increasing their height, a low seat height type chair that can be seated in an easy posture can be provided.
Moreover, in the above-described embodiment, the front portions of the backrest support frame (3) and the seat body (2) are connected to the recumbent body (10a) of the connecting member (10) having a U-shape in the front view in the leg body (1). Since it is pivotally attached to the support base (15) which is provided at the same height as the top of the side leg (9), the seating height is lower and it is possible to sit in a more comfortable posture.

  The front and rear dimensions (17a) of the back support frame (3) are relatively long and not only have a large radius of rotation, but also slant upward and diagonally below the seat (2), and The front lower end is pivotally attached to a position that is almost level with the top of the side leg (9) that forms a U-shape, so that the pivotable angle of the forward arm (17a) can be increased. There is no danger that the rear end will interfere with the floor.

The front legs (9a) and rear legs (9b) of both legs (9) of the leg (1) are widened outward to form a plan view and the front and rear dimensions of the rear legs (9b) are the front legs. Since it is longer than (9a), the chair has high stability and is excellent in stability when the backrest (6) is tilted backward.
Further, since the left and right front legs (9a) are expanded outward, the possibility that the lower limbs of the seated person will hit the front legs (9a) is small.

  In the above embodiment, the forward arm (17a) of the back support frame (3) is pivotally attached to the support base (15), but the tops of the left and right side legs (9), that is, It may be pivotally attached to the inner surface of the short shaft portion (11) via an appropriate reclining mechanism.

  In the above embodiment, the seat body (2) also tilts backward in conjunction with the tilting of the backrest support frame (3). However, the seat body (2) simply includes the support base (15). It may be fixedly provided at an appropriate position in the upper part of the leg (1).

It is a front perspective view showing one embodiment of a chair of the present invention. It is also a front view. It is a side view similarly. Similarly, it is a side view when the backrest is tilted backward. Similarly it is a rear view. It is a perspective view of a leg. It is also a plan view.

Explanation of symbols

(1) Leg
(2) Seat
(3) Back support frame
(4) Backrest board
(5) Cushion body
(6) Backrest
(7) Armrest
(8) Casters
(9) Side legs
(9a) Front leg
(9b) Rear legs
(10) Connecting member
(10a) Standing piece
(10b) Yokohama
(10c) Upward bulge
(11) Short shaft
(12) Mounting piece
(13) Bolt
(14) Cap
(15) Support base
(16) Bolt
(17) Side frame
(17a) Forward arm
(17b) Inward bending
(18) Upper frame
(19) Shaft support
(20) Seat support link
(21) Axis
(22) Seat support piece
(23) Armrest mounting
(24) Seat frame
(25) Axis
(26) Axis

Claims (6)

  In a chair that supports a seat by a supporting base provided on a leg, the left and right 1 in a side view having a front leg that tilts forward and downward and a rear leg that tilts backward and downward A chair comprising a pair of side legs and a connecting member facing in the left-right direction that connects the vicinity of the tops, and the support base is provided on the upper surface of the central part in the left-right direction of the connecting member. .   The connecting member has a U-shape in the front view with upright pieces on both side ends of the recumbent arm, and a support base is provided on the upper surface of the recumbent arm, and the upper ends of both upright pieces are connected to the top surface of the left and right side legs. The chair according to claim 1, which is fixed to the chair.   The chair according to claim 2, wherein both the upright pieces extend forward and upward so that the recumbent is positioned on the rear leg side with respect to the top of the side leg.   The front legs and the rear legs of the left and right side legs are expanded outward so as to form a front-shaped C-shape and a rear-shaped C-shape in plan view, respectively. The chair described in Crab.   The left and right sides of the support base are pivotally attached to the front ends of a pair of left and right forward arms on the back support frame with a back support attached to the front so that the back support frame can tilt backward. The chair according to any one of claims 1 to 4. The front part of the support base protrudes forward from the top part of the side leg, and the lower surfaces of the left and right side parts of the front end part of the seat body are pivotally attached to the left and right side parts of the front end part with the pivots facing in the left and right direction, The chair according to claim 5, wherein the lower surfaces of both sides near the rear part of the seat body are pivotally attached to the left and right forward arms of the back support frame by a pivot that faces in the left-right direction.

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